Arrancars can bankai and maks but have holes. Qunicies have bows but no masks. I think Ivan and crew is something new. But I'm more interested in how they can steal other shinigamis' bankai. Perhaps Ivan can't get Ichigo's bankai because Zangetsu no longer resides in it?
Also, it is interesting how Quincies have that little necklace thing just like a foolbring. Perhaps it all ties in together and Kubo wasn't trolling us after all.